n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 45 |
4 | 286 |
5 | 1820 |
6 | 11628 |
7 | 74613 |
8 | 480700 |
9 | 3108105 |
10 | 20160075 |
11 | 131128140 |
12 | 854992152 |
13 | 5586853480 |
14 | 36576848168 |
15 | 239877544005 |
16 | 1575580702584 |
17 | 10363194502115 |
18 | 68248282427325 |
19 | 449972009097765 |
20 | 2969831763694950 |
21 | 19619725782651120 |
22 | 129728497393775280 |
[1,7,45,286,1820,11628,74613,480700,3108105, 20160075,131128140,854992152,5586853480, 36576848168,239877544005,1575580702584, 10363194502115,68248282427325,449972009097765, 2969831763694950,19619725782651120, 129728497393775280] |